Five questions on lesson 2 of The history of the brilliant. The questions and the answers to pick from come in a new order every time you start.
Pick an answer, and the question marks itself. For a question that you answer in your own words, think of your answer first. Then show our answer and say whether you had it. Nothing is saved or sent.
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Question 1: Why does a rose cut show so little fire?
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b: The same angle in and out means every color bends by the same amount both ways.
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Question 2: Why are the Mazarin and the next two cuts cushions and not rounds?
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b: Bruting to a true circle came only in the 1800s (lesson 5).
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Question 3: How many facets does the Mazarin have above the girdle, not counting the table?
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b: 16, twice the old single. That's why its name is the double cut.
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Question 4: The Mazarin has more facets than the old single. Which score goes up, and why?
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Scintillation, 44 → 61: the Wheel counts it from the facets, and the Mazarin has 42 instead of 26.
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Question 5: Name one reason the Mazarin's brilliance doesn't go up too.
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Nobody calculated its angles: a steep pavilion, a deep stone and 17% of the light leaks out.
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